5 Big Meat Companies Produce A Combined 162 Million Tons Of Manure Each Year

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10. not so simple

http://www.sustainabletable.org/906/waste-management

Under the current system of animal production, however, there is always more manure available than can possibly be absorbed by the soil as fertilizer. In fact, studies show that between 1982 and 1997, as industrial agriculture grew, the US experienced a 64 percent increase in the amount of manure that could not be absorbed by our soils. FThis practice is not only harmful to the soil, but can also result in contamination of human drinking water and lead to serious public health problems.

People often believe that animal manure is harmless, but in truth it can be quite hazardous. Factory livestock facilities pollute the air and release over 400 separate gasses, mostly due to the large amounts of manure they produce. FThe principal gases released are hydrogen sulfide, methane, ammonia, and carbon dioxide. FGasses can be dangerous air pollutants that threaten both the environment and human health. Nitric oxides are also released in large quantities from farms through manure application, and are among the leading causes of acid rain. F